drm/i915: Fix DEIER and GTIER collecting for BDW.
BDW has many other Display Engine interrupts and GT interrupts registers. Collecting it properly on gpu_error_state. On debugfs all was properly listed already but besides we were also listing old DEIER and GTIER that doesn't exist on BDW anymore. This was causing unclaimed register messages v2: Fix small issues of first version and don't read DEIER regs when pipe's power well is disabled v3: bikeshed accepted: use enum pipe pipe instead of int i for pipe interection v4: Ben notice previous version was checking for display_power_enabled without using propper locks. Using _unlocked version isn't reliable and we cannot get this registers when power well is off. So let's avoid getting all DE_IER per pipe for now. If someone think this is an useful information it can be added later. v5: Ben: put back debugfs stuff that might be coverred by pm_get and use gen >= 8 trying to predict future. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81701 Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com> Reviewed-by: NBen Widawsky <ben@bwidawsk.net> Reviewed-by: N(v3) Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: NRodrigo Vivi <rodrigo.vivi@intel.com> Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
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